Advanced Sensing Techniques for Cognitive Radio by Guodong Zhao download in pdf, ePub, iPad
Increasing the number of cooperating sensing nodes decreases the probability of false detection. Cyclostationary detectors can be either single cycle or multicycle cyclostatonary.
Process by which a cognitive-radio user changes its frequency of operation. This white space is unused television channels in the geolocated areas. This standard uses geolocation and spectrum sensing for spectral awareness. Independent studies performed in some countries confirmed that observation, and concluded that spectrum utilization depends on time and place.
Spectrum sharing cognitive radio networks allow cognitive radio users to share the spectrum bands of the licensed-band users. Detecting primary users is the most efficient way to detect empty spectrum. Cognitive radio, by comparison, allows user terminals to sense whether a portion of the spectrum is being used in order to share spectrum with neighbor users. Capturing the best available spectrum to meet user communication requirements, while not creating undue interference to other primary users.
Spectrum sensing observes the spectrum and identifies occupied channels. These initiatives have focused cognitive-radio research on dynamic spectrum access. These detectors are robust against noise variance uncertainty. To implement energy detector, however, noise variance information is required.
If the white space database judges that destructive interference to incumbents will happen, the cognitive radio user is denied access to the shared spectrum. Based on the detection results, cognitive radio users decide their transmission strategies. Geolocation combines with a database of licensed transmitters in the area to identify available channels for use by the cognitive radio network.
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